Punching assistant device

ABSTRACT

Disclosed is a punching assistant device. The punching assistant device includes: a first shaft arranged perpendicular to a working surface; a second shaft perpendicularly coupled to the first shaft; and a grinder mounting member coupled to the second shaft, wherein the grinder mounting member is rotatable around the first shaft.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a 371 of International Application No. PCT/KR2019/000027 filed on Jan. 2, 2019, which claims priority to Korean Patent Application No. 10-2018-0029215 filed on Mar. 13, 2018, the disclosures of which are herein incorporated by reference in their entirety.

BACKGROUND 1. Field

The disclosure relates to a punching assistant device that is portable due to a light weight and enables convenient and precise punching.

2. Description of Related Art

Recently, for space utilization and aesthetic reasons, punching is performed on an interior ceiling formed of a tex or an integral type panel, and a product is installed in a punched hole.

To this end, according to the related art, in case of performing punching on an interior ceiling, the punching has been performed in a manner in which a worker draws, on the ceiling, a rough sketch of a circle to be punched, and directly cuts a part of the ceiling based on the rough sketch of the circle drawn on the ceiling.

However, with such a punching method according to the related art, it is difficult for the worker to manually and accurately perform punching based on the rough sketch of the circle, and precision of the punched circle varies depending on skill of the worker. Particularly, in case that the worker cuts the ceiling based on the rough sketch of the circle by using a grinder, which is a generally used punch, to perform punching, it is difficult to perform precise punching due to the grinder which tends to move in straight line.

SUMMARY

A disclosure is providing a punching assistant device that enables accurate punching of a circle in a ceiling with a grinder, which is a punch generally used.

And the disclosure is providing a punching assistant device with minimized volume.

According to an embodiment of the disclosure, a punching assistant device includes: a first shaft arranged perpendicular to a working surface; a second shaft perpendicularly coupled to the first shaft; and a grinder mounting member coupled to the second shaft, wherein the grinder mounting member is rotatable around the first shaft.

The grinder mounting member may include a first opening opened toward the working surface, and a second opening which communicates with the first opening and into which a grinder is insertable.

The grinder mounting member may include a receiving portion coupled to the second shaft, and including a receiving space that includes the first opening and the second opening, and a cover portion detachably coupled to the receiving portion and covering a part of the second opening.

The receiving portion may include a work supporting surface that comes into contact with the working surface.

The receiving portion may include a dust discharge port communicating with the receiving space.

The receiving portion may include a coupling hole into which the second shaft is inserted and coupled.

The punching assistant device may further include a connection member which is rotatably connected to one end of the first shaft and to which one end of the second shaft is connected.

The connection member may include a first portion rotatably connected to the one end of the first shaft, a hinge shaft coupled to the first portion, and a second portion which is pivotably coupled to the hinge shaft and to which the one end of the second shaft is connected.

At least one of the first shaft or the second shaft may have a multistage structure in which a length is changeable.

The punching assistant device may further include a first fixing member coupled to one end of the first shaft and coming into contact with the working surface.

The first fixing member may include a fixing pin penetrating through the working surface.

The first fixing member may include a first supporting surface on which the fixing pin is arranged and which has a diameter larger than a diameter of the one end of the first shaft.

The punching assistant device may further include a second fixing member coupled to the other end of the first shaft that is opposite to one end of the first shaft, and including a second supporting surface with a diameter larger than a diameter of the other end of the first shaft.

The receiving portion may include at least one supporting portion protruding toward the receiving space.

According to another embodiment of the disclosure, a punching assistant device includes: a first shaft arranged perpendicular to a working surface; a second shaft perpendicularly coupled to the first shaft; a grinder mounting member coupled to the second shaft; and a connection member which is rotatably connected to one end of the first shaft and to which one end of the second shaft is connected, wherein the grinder mounting member is attachable and detachable to and from a grinder, and the grinder mounting member includes an opening opened toward the working surface, and a work supporting surface configured to come into contact with the working surface.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view illustrating a punching assistant device according to an embodiment of the disclosure.

FIG. 2 is an exploded perspective view illustrating the punching assistant device according to the embodiment of the disclosure.

FIG. 3 is an enlarged view of a part III of the punching assistant device illustrated in FIG. 2.

FIG. 4 is a perspective view illustrating a grounder mounting member.

FIG. 5 is an exploded perspective view of the grounder mounting member.

FIG. 6 is a side view illustrating a receiving portion of the grinder mounting member when viewed in a VI direction illustrated in FIG. 5.

FIG. 7 is a perspective view illustrating a state in which a grinder is coupled to the punching assistant device.

FIG. 8 is a perspective view illustrating that the length of a first shaft is changed.

FIGS. 9 is perspective views illustrating a process in which the punching assistant device is folded.

FIGS. 10 is perspective views illustrating a process in which the punching assistant device is folded.

FIGS. 11 is perspective views illustrating a modified embodiment of the punching assistant device.

FIGS. 12 is perspective views illustrating a modified embodiment of the punching assistant device.

DETAILED DESCRIPTION

In order to allow full understanding of configurations and effects according to the disclosure, embodiments of the disclosure will be described with reference to the accompanying drawings. The disclosure may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, and various modifications may be made. It should be understood, however, that the description of the embodiments is provided to enable the disclosure of the disclosure to be complete, and will fully convey the scope of the disclosure to a person having ordinary skill in the art to which the disclosure pertains. In the accompanying drawings, the constituent elements are enlarged in size for convenience of explanation and the proportion of each constituent element may be exaggerated or reduced.

It will be understood that when a constituent element is referred to as being “on” or connected to” another element, it may be directly connected or directly coupled to another constituent element, or an intervening constituent element may be consisted therebetween. In contrast, when a constituent element is referred to as being “directly on” or “directly connected to” another constituent element, no intervening constituent element is consisited therebetween. Other expressions describing relationships between constituent elements such as “between A and B” and “directly between A and B” may be construed similarly.

Terms such as “first” and “second” may be used to describe various constituent elements, but the constituent elements are not to be construed as being limited to the terms. The terms are only used to differentiate one constituent element from another constituent element. For example, the “first” constituent element may be named the “second” constituent element without being departed from the scope of the disclosure and the “second” constituent element may also be similarly named the “first” constituent element .

Singular forms are intended to include plural forms unless the context clearly indicates otherwise. Terms “include” or “have” used in the specification are to specify the presence of stated features, numerals, steps, operations, components, parts, or a combination thereof, and it may be construed that addition of one or more other features, numerals, steps, operations, components, parts, or a combination thereof is possible.

Unless otherwise defined, all terms used in the embodiments of the disclosure have the same meaning as commonly understood by a person having ordinary skills in the art to which the disclosure pertains.

FIG. 1 is a perspective view illustrating a punching assistant device 1 according to an embodiment of the disclosure, FIG. 2 is an exploded perspective view illustrating the punching assistant device 1 according to the embodiment of the disclosure, and FIG. 3 is an enlarged view of a part III of the punching assistant device 1 illustrated in FIG. 2.

Hereinafter, a structure of the punching assistant device 1 according to the embodiment of the disclosure will be described with reference to FIGS. 1 to 3.

The punching assistant device 1 includes a first shaft 100, a second shaft 200, a connection member 300, a grinder mounting member 400, a first fixing member 500, and a second fixing member 600.

The first shaft 100 may be arranged perpendicular to a working surface S (see FIG. 7), which is a lower surface of a tex T (see FIG. 7) forming a ceiling, and may be arranged perpendicular to a ground surface in a working space. Further, the first shaft 100 may be arranged at the center of an opening to be punched. Therefore, the punching assistant device 1 may rotate around the first shaft 100 to punch a circular opening in the working surface S.

The first shaft 100 may have a multistage structure in which the length of the first shaft 100 may be changed. Therefore, the length of the first shaft 100 may be adjusted according to a height from a floor to a ceiling in various working spaces, and thus the first shaft 100 may be stably fixed between the floor and the ceiling.

The first shaft 100 may have a multistage structure including a plurality of shafts combined sequentially along a length direction. For example, the first shaft 100 may have a structure in which a plurality of pipes with different diameters are included, and pipes with smaller diameters are sequentially inserted into a pipe with the largest diameter. Accordingly, the length of the first shaft 100 may be changed. As a result, a volume of the punching assistant device 1 is decreased, and thus it may be easy to carry and store the punching assistant device 1. In the multistage structure of the first shaft 100, the changed length may be fixed by using various fixing structures such as a bolt fixing structure and a screw fixing structure according to the related art.

Further, the first shaft 100 may be formed of various materials such as a plastic material and a metal material as needed.

The second shaft 200 is perpendicularly coupled to the first shaft 100. The second shaft 200 may be perpendicularly coupled to the first shaft 100 through the connection member 300.

Specifically, one end 200 a of the second shaft 200 is connected to the connection member 300, and the other end 200 b that is opposite to the one end 200 a is connected to the grinder mounting member 400.

The second shaft 200 may have a length corresponding to a radius of an opening to be punched. Therefore, the length of the second shaft 200 corresponds to the radius of the opening to be punched in the working surface S.

Further, the second shafts 200 with various lengths may be applied to the punching assistant device 1 depending on a diameter of an opening to be punched.

Further, similarly to the first shaft 100, the second shaft 200 may also have a structure in which the length of the second shaft 200 may be changed, and openings with various diameters may be punched in the working surface S by changing the length of the second shaft 200.

The second shaft 200 may be formed of various materials such as a plastic material and a metal material as needed.

Referring to FIG. 3, the connection member 300 is rotatably connected to one end 100 a of the first shaft 100, and the one end 200 a of the second shaft 200 is connected to the connection member 300. Accordingly, the connection member 300 connects the first shaft 100 and the second shaft 200 to each other, and the second shaft 200 may be arranged perpendicular to the first shaft 100. Further, the connection member 300 is rotatably connected to the first shaft 100, and thus the second shaft 200 may rotate around the first shaft 100.

Specifically, the connection member 300 includes a first portion 301, a second portion 302, and a hinge shaft 303.

The first portion 301 is rotatably connected to the one end 100 a of the first shaft 100.

Specifically, the first portion 301 includes a first insertion port 301 a into which the one end 100 a of the first shaft 100 may be inserted.

An inner diameter D2 of the first insertion port 301 a is larger than an outer diameter D1 of the one end 100 a of the first shaft 100. Therefore, the one end 100 a of the first shaft 100 may be inserted into the first insertion port 301 a of the first portion 301, and the first portion 301 may rotate around the first shaft 100.

The second portion 302 is pivotably coupled to the hinge shaft 303 coupled to the first portion 301, and the one end 200 a of the second shaft 200 is fitted into the second portion 302. Accordingly, the second portion 302 may pivot (in an R direction of FIG. 9) around the hinge shaft 303 to make the second shaft 200 overlap with the first shaft 100.

The grinder mounting member 400 may be connected to the second shaft 200 to rotate around the first shaft 100. Therefore, as the grinder mounting member 400 rotates around the first shaft 100 in a state in which a general cutting machine such as a grinder G (see FIG. 7) is mounted on the grinder mounting member 400, it is possible to easily punch a circular opening in the working surface S by using the grinder G rotating around the first shaft 100. The grinder G is the same as or similar to that according to a general technology. Therefore, a description thereof will be omitted, and a specific structure of the grinder mounting member 400 will be described later.

Further, the first fixing member 500 is coupled to the one end 100 a of the first shaft 100, and the second fixing member 600 is coupled to the other end 100 b that is opposite to the one end 100 a.

The first fixing member 500 is coupled to the one end 100 a of the first shaft 100 and comes into contact with the working surface S.

Specifically, the first fixing member 500 includes an insertion portion 501, a first supporting surface 502, and a fixing pin 503.

The insertion portion 501 has an outer diameter D4 smaller than the inner diameter D2 of the first insertion port 301 a, and is inserted into the first insertion port 301 a. A second insertion port 501 a with an inner diameter D3 larger than the outer diameter D1 of the one end 100 a of the first shaft 100 is formed in the insertion portion 501. Therefore, the one end 100 a of the first shaft 100 a is inserted into the second insertion port 501 a in a state in which the insertion portion 501 is inserted into the first insertion port 301 a.

Further, in case that the insertion portion 501 is fitted into the first insertion port 301 a, the first fixing member 500 and the connection member 300 may integrally rotate around the first shaft 100.

In addition, the outer diameter D1 of the one end 100 a of the first shaft 100 is smaller than the inner diameter D3 of the second insertion port 501 a. Therefore, the connection member 300 and the first fixing member 500 may integrally rotate around the fixed first shaft 100 by using a gap between the outer diameter D1 of the one end 100 a and the inner diameter D3 of the second insertion port 501 a.

In addition, in case that the outer diameter D1 of the one end 100 a of the first shaft 100 is similar to the inner diameter D3 of the second insertion port 501 a, the one end 100 a of the first shaft 100 is thus fitted into the second insertion port 501 a, and an additional protruding portion (not illustrated) for interfering with and supporting the connection member 300 is formed along an outer circumferential surface on the lower side of the insertion portion 501, the connection member 300 may rotate around the first shaft 100 in a state in which the first shaft 100 and the first fixing member 500 are integrally fixed, by using a gap between the outer diameter D4 of the insertion port 501 and the inner diameter D2 of the first insertion port 301 a.

However, a bearing (not illustrated) may be arranged between the one end 100 a of the first shaft 100 and the second insertion port 501 a of the first fixing member 500 to allow the connection member 300 to rotate around the first shaft 100, as needed.

The first supporting surface 502 is formed integrally with the insertion portion 501 and has a diameter larger than the diameter of the first shaft 100.

Specifically, the first supporting surface 502 comes into contact with the working surface S, and may have a diameter larger than the outer diameter D1 of the first shaft 100 to enable stable fixation of the first shaft 100 to the working surface S.

However, the first supporting surface 502 may have various shapes each with an area larger than an area of a circle with the outer diameter D1 of the first shaft 100 as needed.

The fixing pin 503 may be arranged on the upper side of the first supporting surface 502 and penetrate through the working surface S. Therefore, the first shaft 100 may be stably fixed to the working surface S.

The fixing pin 503 is arranged at the center of an opening to be punched in the working surface S, and may penetrate through the center of the opening to be punched.

The second fixing member 600 is coupled to the other end 100 b of the first shaft 100 that is opposite to the one end 100 a.

Specifically, the second fixing member 600 includes a second supporting surface 601, a second insertion portion 602, and a protruding portion 603.

The second supporting surface 601 may have a diameter larger than a diameter of the other end 100 b of the first shaft 100 to enable stable support of the first shaft 100 to the floor of the working space. However, the second supporting surface 601 may have various shapes each with an area larger than an area of a circle with the diameter of the other end 100 b of the first shaft 100 as needed.

The second insertion portion 602 is formed integrally with the second supporting surface 601, and inserted into the other end 100 b of the first shaft 100 to connect the first shaft 100 and the second fixing member 600 to each other.

The protruding portion 603 protrudes along an outer circumferential surface of the second insertion portion 602 and comes into contact with the other end 100 b of the first shaft 100 to support the first shaft 100.

FIG. 4 is a perspective view illustrating the grounder mounting member 400, FIG. 5 is an exploded perspective view of the grounder mounting member 400, and FIG. 6 is a side view illustrating a receiving portion of the grinder mounting member when viewed in a VI direction illustrated in FIG. 5.

Hereinafter, a specific structure of the grinder mounting member 400 will be described with reference to FIGS. 4 to 6.

As described above, the grinder mounting member 400 may be coupled to the other end 200 b of the second shaft 200 and rotate around the first shaft 100. Further, the grinder mounting member 400 may rotate around the first shaft 100 in a state in which the grinder G is mounted, to punch an opening in the working surface S.

The grinder mounting member 400 includes a cover portion 410 and a receiving portion 420 that includes a receiving space 403.

Specifically, the receiving space 403 includes a first opening 401 that is opened toward the working space S, and a second opening 402 which communicates with the first opening 402 and into which the grinder G may be inserted.

In case that the grinder G is coupled to the first opening 401, a blade of the grinder G may protrude toward the working surface S through the first opening 401. The first opening 401 may have various shapes as needed as long as the blade of the grinder 5 may protrude through the first opening 401.

The second opening 402 may have a shape corresponding to an outward shape of the grinder G.

The cover portion 410 is detachably coupled to the receiving portion 420, and covers a part of the second opening 402. Therefore, in case that the grinder G is coupled to the grinder mounting member 400 and punching is performed on the working surface S, the cover portion 410 may prevent scattered materials generated in a punching process from being scattered to the outside of the grinder mounting member 400 through the second opening 402.

In case that the grinder G is coupled to the grinder mounting member 400, the cover portion 410 may have various shapes as long as it is possible to prevent the scattered materials from being scattered to the outside of the grinder mounting member 400.

The receiving portion 420 forms an appearance of the grinder mounting member 400, and includes the receiving space 403, a work supporting surface 404, a dust discharge port 405, a seating surface 406, a supporting portion 407, a coupling opening 408, and a bolt coupling opening 409.

The work supporting surface 404 comes into contact with the working surface S and is formed of a flat plate with a predetermined area. Therefore, in case that the grinder G is mounted on the grinder mounting member 400, and punching is performed on the working surface S, the working surface S is positioned on the work supporting surface 404, and thus punching may be performed in a state in which the working surface S is stably supported.

The dust discharge port 405 is formed on one side of the receiving portion 420 and communicates with the receiving space 403. The dust discharge port 405 may discharge the scattered materials generated in the punching process to the outside of the receiving portion 420. Further, the dust discharge port 405 may be connected to an external suction device (not illustrated) such as a cleaner to more easily discharge the scattered materials.

The seating surface 406 may come into contact with an external housing (not illustrated) of the grinder G, and thus the grinder G may be stably fixed to the grinder mounting member 400. The seating surface 406 may have various shapes that may fix the external housing of the grinder G by coming into contact with the external housing of the grinder G.

The supporting portion 407 may protrude from the seating surface 406 toward the receiving space 403, and the number of supporting portions 407 may be at least one. The at least one supporting portion 407 may interfere with the external housing of the grinder G to stably fix the grinder G to the grinder mounting member 400. For example, the supporting portion 407 is fitted into the external housing of the grinder G seated on the seating surface 406 to stably fix the grinder G in the receiving space 403.

As illustrated in FIG. 6, as the coupling opening 408 is formed on the outer side of the receiving portion 420, and the other end 200 b of the second shaft 200 is inserted into the coupling opening 408, the other end 200 b of the second shaft 200 is fitted into the coupling opening 408. As a result, the coupling opening 408 may connect the grinder mounting member 400 and the second shaft 200 to each other.

The bolt coupling opening 409 is formed on one side of the receiving portion 420 and communicates with the receiving space 403. The number of bolt coupling openings 409 may be at least one. In case that a general bolt (not illustrated) is coupled to the bolt coupling opening 409, the bolt may come into contact with the external housing of the grinder G mounted on the grinder mounting member 400 to stably fix the grinder G in the grinder mounting member 400.

FIG. 7 is a perspective view illustrating a state in which the grinder G is coupled to the punching assistant device 1.

Hereinafter, a punching process using the punching assistant device 1 to which the grinder G is coupled will be described in detail with reference to FIG. 7.

First, the first shaft 100 is arranged perpendicular to the tex T by adjusting the length of the first shaft 100 according to a height between the tex T and the floor, the tex T forming the ceiling. Here, the fixing pin 503 of the first fixing member 500 connected to the one end 100 a of the first shaft 100 penetrates through the tex T, and thus the first shaft 100 may be more stably fixed to the tex T.

Then, the grinder G is mounted on the grinder mounting member 400, and the grinder G coupled to the grinder mounting member 400 rotates around the first shaft 100 in a state in which the work supporting surface 404 is in contact with the working surface S, thereby cutting the working surface S.

Specifically, as the grinder mounting member 400 and the grinder G rotate in a P direction along a circular track C illustrated in FIG. 7, an opening with a radius corresponding to the length of the second shaft 200 may be formed.

Therefore, the tex T forming the ceiling may be conveniently and accurately punched with a hole with a shape corresponding to the circular track C, and a desired product may be installed in the punched portion. Further, the general grinder G may be detachably mounted on the punching assistant device 1, and thus no additional cost for a separate punch is not required.

FIG. 8 is a perspective view illustrating that the length of the first shaft 100 is changed.

Hereinafter, a state in which the length of the first shaft 100 is changed will be described in detail with reference to FIG. 8.

As described above, the first shaft 100 has a multistage structure comprising pipes with different outer diameters, and pipes with smaller outer diameters may be inserted into a pipe with the largest outer diameter.

Therefore, in case that the height from the floor to the ceiling is lower, a part of the first shaft 100 may be inserted in a Q direction to adjust the height of the first shaft 100, and the punching assistant device 1 may be used for various heights.

FIGS. 9 and 10 are perspective views illustrating a process in which the punching assistant device 1 is folded.

Hereinafter, a process in which the punching assistant device 1 is folded for portability will be described in detail with reference to FIGS. 9 and 10.

As described above, the length of the first shaft 100 may be changed. Specifically, the first shaft 100 may include pipes with different diameters, and pipes with smaller diameters may be sequentially inserted into a pipe with the largest diameter.

In the punching assistant device 1 in a state illustrated in FIG. 1, pipes included in the first shaft 100 may be inserted into a pipe with the largest pipe as illustrated in FIG. 9. Then, the second shaft 200 connected to the connection member 300 may pivot around the hinge shaft 303 of the connection member 300 along an R direction, and the punching assistant device 1 may be in a folded state as illustrated in FIG. 10.

As a result, the volume of the punching assistant device 1 is minimized, and thus a worker may easily carry and store the punching assistant device 1.

FIGS. 11 and 12 are perspective views illustrating a modified embodiment of the disclosure.

Hereinafter, a punching assistant device 1′ according to a modified embodiment will be described in detail with reference to FIGS. 11 and 12.

The punching assistant device 1′ illustrated in FIGS. 11 and 12 includes the same components as the first shaft 100, the connection member 300, the grinder mounting member 400, the first fixing member 500, and the second fixing member 600 of the punching assistant device 1 illustrated in FIG. 1, and an overlapping description thereof will be omitted.

A second shaft 200′ may have a multistage structure including a plurality of shafts combined sequentially along a length direction. For example, the second shaft 200′ may have a structure in which a plurality of pipes with different diameters are included, and pipes with smaller diameters are sequentially inserted into a pipe with the largest diameter. Therefore, the length of the second shaft 200′ may be changed. In the multistage structure of the second shaft 200′, the changed length may be fixed by using various fixing structures such as a bolt fixing structure and a screw fixing structure according to the related art.

Accordingly, in case that the length of the second shaft 200′ is minimized, a volume of the punching assistant device 1′ is decreased, and thus it may be easy to carry and store the punching assistant device 1′.

In addition, as described above, openings with various diameters may be punched in the working surface S by changing the length of the second shaft 200′. Therefore, the punching assistant device 1′ on which the grinder G is mounted may form an opening in the working surface S in consideration of various sizes of products to be installed.

Although the various embodiments of the disclosure have been individually described hereinabove, the respective embodiments are not necessarily implemented singly, but may also be implemented so that configurations and operations thereof are combined with those of one or more other embodiments.

Although embodiments of the disclosure have been illustrated and described hereinabove, the disclosure is not limited to the abovementioned specific embodiments, but may be variously modified by those skilled in the art to which the disclosure pertains without departing from the gist of the disclosure as disclosed in the accompanying claims. These modifications should also be understood to fall within the scope and spirit of the disclosure. 

1. A punching assistant device comprising: a first shaft arranged perpendicular to a working surface; a second shaft perpendicularly coupled to the first shaft; and a grinder mounting member coupled to the second shaft, wherein the grinder mounting member is rotatable around the first shaft.
 2. The punching assistant device as claimed in claim 1, wherein the grinder mounting member includes a first opening opened toward the working surface, and a second opening which communicates with the first opening and into which a grinder is insertable.
 3. The punching assistant device as claimed in claim 2, wherein the grinder mounting member includes a receiving portion coupled to the second shaft, and including a receiving space that includes the first opening and the second opening, and a cover portion detachably coupled to the receiving portion and covering a part of the second opening.
 4. The punching assistant device as claimed in claim 3, wherein the receiving portion includes a work supporting surface coming into contact with the working surface.
 5. The punching assistant device as claimed in claim 3, wherein the receiving portion includes a dust discharge port communicating with the receiving space.
 6. The punching assistant device as claimed in claim 3, wherein the receiving portion includes a coupling hole into which the second shaft is inserted and coupled.
 7. The punching assistant device as claimed in claim 1, further comprising a connection member which is rotatably connected to one end of the first shaft and to which one end of the second shaft is connected.
 8. The punching assistant device as claimed in claim 7, wherein the connection member includes a first portion rotatably connected to the one end of the first shaft, a hinge shaft coupled to the first portion, and a second portion which is pivotably coupled to the hinge shaft and to which the one end of the second shaft is connected.
 9. The punching assistant device as claimed in claim 1, wherein at least one of the first shaft or the second shaft has a multistage structure in which a length is changeable.
 10. The punching assistant device as claimed in claim 1, further comprising a first fixing member coupled to one end of the first shaft and coming into contact with the working surface.
 11. The punching assistant device as claimed in claim 10, wherein the first fixing member includes a fixing pin penetrating through the working surface.
 12. The punching assistant device as claimed in claim 11, wherein the first fixing member includes a first supporting surface on which the fixing pin is arranged and which has a diameter larger than a diameter of the one end of the first shaft.
 13. The punching assistant device as claimed in claim 1, further comprising a second fixing member coupled to the other end of the first shaft that is opposite to one end of the first shaft, and including a second supporting surface with a diameter larger than a diameter of the other end of the first shaft.
 14. The punching assistant device as claimed in claim 3, wherein the receiving portion includes at least one supporting portion protruding toward the receiving space.
 15. A punching assistant device comprising: a first shaft arranged perpendicular to a working surface; a second shaft perpendicularly coupled to the first shaft; a grinder mounting member coupled to the second shaft; and a connection member which is rotatably connected to one end of the first shaft and to which one end of the second shaft is connected, wherein the grinder mounting member is attachable and detachable to and from a grinder, and the grinder mounting member includes an opening opened toward the working surface, and a work supporting surface configured to come into contact with the working surface. 